Steam-boiler draft-increasing device



A. CHAPELON l Jan. 15,A 1929. 1,699,134

STEAK BOILER DRAFT INCREASING DVICB Filed Aug. 20. 1927 AT THN V Patented Jan. 1S, 1929;

UNITED STATES ANDR CHAPELON, OF LEVALLOIS, FRANCE.

STEAM-BCILER DRAFT-INCREASING DEVICE.

Application led August 20, 1927, Serial' No. 214,410, and in France August 21, 1926.

lily .invention `relates to a device adapted to increase the draught oi boilers for locomotives and other steam engines, While decreasing the steam pressure in the exhaust pipe, a better utilization ot' steam in the cylinders of the engine being thus obtained because of the reduced back-pressure on the pistons.

An object of my invention is to provide a device oit this kind wherein the length is made relatively short to suit the characteristics of the locomotives; of such design that very eflicient action is assured.

In order to make my invention clearly understood I have illustrated, as examples, several embodiments of the same in the drawings appended hereto wherein:

Figure l shows one form of my invention.

Fig. 2 shows another form.

Figures 3, 4e and 5 show further modilications; and

Iligure G illustrates atwyer suitable for use with the devices shown by Figures l to shown by Figures 1 and 2 in the drawappended hereto, my device consists entially of the combination of a nozzle (Figure l) or of a series of nozzles 1, i 1 (Figure 2) provided with complete or incomplete spiders or with inside plugs, and disposed in line with the exhaust pipe 3; with a` cylindrical or conical nozzle 2, unobstructed inside, and located between the lirst nozzles and the stack d.

The aforesaid series of nozzles will permit the length oi the device to be reduced sufficiently to permit the saine to be mounted on a iocomotive, notwithstanding restricted gauge; the last nozzle 2, whether cylindrical or conical, affording perfect operation of the stack.

Where the dimensions of the boiler are suitable, the above described device can be` simpliiied through substituting for the stack I therefore unite said nozzle 2 and stack il by giving them new forms and proportions, like those shown at 2 and 4 (Figure 5), so that the mixing of gases and steam in nozzle 2 and exhaust thereof through stack 4 will take place under best possible theoretical and practical conditions.

The result from this combination is a remarkable increase of the draught, the greater indeed the more the speed of the engine is increased.

My invention may also advantageously ini clude a steam exhaust twyer or pipe as illusi trated in Fig. 6 which in practice is placed over the exhaust pipe 3 and between the same and the nozzle or nozzles in line therewith. This twyer is conical inside, the interior sloping about 300 and at its up per end it terminates in an inside cylindrical portion B of moderate length. It also has at its upper end a number of internal projections C which are triangular in crosssection, the apex being presented toward the exhaust pipe 3 so as to divide and ilare out the steam jet.

Having now particularly ascertained and described the nature of my said invention as Well as the manner in which the same is to be performed, I declare that what I claim is.

1. A device for increasing the draught of locomotives comprising one or more nozzles in line with the steam exhaust pipe, said nozzles having means inside to divide and spread the exhaust steam, another nozzle unobstructed inside, and an exhaust twyer conical inside and having a cylindrical portion and projections on its interior to divide the exhaust steam and spread the same. i

2. A device for increasing the draught of locomotive boilers comprising one or more nozzles between the stack and the exhaust pipe, said nozzles having means inside to divide and spread the exhaust steam, the stack terminating at its lower end above the nozzles in an inverted truncated section, and an exhaust twyer conical in shape having a cylindrical section on its interior at the top carrying inside devices to divide and spread the exhaust steam from the exhaust pipe. f n

In testimony whereof I aiix my signature.

ANDR oHAPELoN. 

